Steven Miller, the agency’s ousted acting commissioner, will spend several hours on Friday morning in the ornate House Ways and Means Committee room explaining his role in a scandal that has captivated Washington for a week.

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IRS heads roll: Is Lerner next?

POLITICO Junkies: How much trouble is White House in?

Miller will sit before lawmakers who have turned him into an example of government overreach. And he’ll be at the same witness table as the inspector general who wrote the damaging report that led the Obama administration to show him the door.

For all the ink that has been spilled on the IRS’s practice of scrutinizing conservative groups applying for a tax exemption, there’s still plenty new territory to cover in the first congressional hearing on the scandal.

Here is a breakdown of what is still unknown:

How did all this “screening” get started?

Not much has come out about how the IRS wound up in this mess in the first place — namely, how the screening of conservative groups really began.

The inspector general’s report doesn’t delve into these details, merely stating that employees in the agency’s Cincinnati office began flagging groups for extra scrutiny if they included words such as “tea party” or “patriots.”

The practice of using search terms as a shortcut to determine which social welfare organizations will get more scrutiny is very common.

Republicans are wondering whether the employees who targeted conservative groups had political motivations for doing so and are sure to view Miller’s denial of bias with skepticism. They’re likely to pry more into how the agency decided which terms to use as a trigger for extra review.

Those decisions can mean the difference between a group waiting a few weeks or a few years to win IRS approval for a tax exemption.

So far, the casualty count is two: Miller and Joseph Grant, the commissioner of the agency’s tax exempt and government entities division who said on Thursday he plans to step down.

But the resignations might not stop there.

Lois Lerner, director of the tax exempt and government entities division, leapt to national fame last week when she acknowledged the targeting program and started the debacle.

House Oversight and Government Reform Committee Chairman Darrell Issa has accused her of misleading Congress on four separate occasions.

Lawmakers have called on her to step down and she’s certain to be called before at least one congressional panel to provide her story.

But while Obama essentially fired Miller, there are limits on what else he can order. The IRS has only two political appointees — the commissioner and the chief counsel — and the rest of its employees are protected by civil service regulations.

Has the IRS disciplined employees in Cincinnati?

Miller told lawmakers during private meetings that the agency has homed in on two “rogue” employees in the Cincinnati office tasked with reviewing nonprofits’ applications for tax-exempt status, according to CNN. And a Fox affiliate in Cincinnati said four staffers could be involved in unfairly singling out conservative groups.